CN106546218A - A kind of high mountain permafrost distinguishes cloth subgrade settlement monitoring system and method - Google Patents
A kind of high mountain permafrost distinguishes cloth subgrade settlement monitoring system and method Download PDFInfo
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- CN106546218A CN106546218A CN201611054851.XA CN201611054851A CN106546218A CN 106546218 A CN106546218 A CN 106546218A CN 201611054851 A CN201611054851 A CN 201611054851A CN 106546218 A CN106546218 A CN 106546218A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
A kind of high mountain permafrost distinguishes cloth subgrade settlement monitoring system and method, it is related to civil engineering monitoring field observation device and measuring method, in order to overcome that existing roadbed settlement monitoring method measurement range is limited, durability is not enough, the problem of extreme environment poor work stability.Many of the present invention are longitudinally continuous formula steel strand wires and strengthen the parallel distribution of distributed sensing fiber, many horizontal fixed-point type polymer strengthen the parallel distribution of distributed sensing fiber, and longitudinal direction sensor fibre is vertical with horizontal sensor fibre, laterally sensor fibre passes through thermometric steel pipe, fiber-optical grating temperature sensor is fixed on the outer wall of thermometric steel pipe, Brillouin's time-domain analysis system is used for the Strain Distribution for obtaining sensor fibre, fiber Bragg grating (FBG) demodulator is used for the Temperature Distribution for obtaining fiber-optical grating temperature sensor, according to the data acquisition subgrade settlement for obtaining.The present invention is applied to the subgrade settlement in high mountain permafrost region and monitors.
Description
Technical field
The present invention relates to roadbed in a kind of civil engineering monitoring field observation device and measuring method, especially road engineering
The displacement measuring device and measuring method of sedimentation.
Background technology
High mountain permafrost area highway is relatively low due to being located in extreme climate, winter temperature, and soil moisture freezes and causes
Road Frost ＆ Bulge, summer temp are raised, and in soil, ice sheet melts, and long-term Frozen-thawed cycled causes subgrade settlement problem serious, need into
The long-term large-scale settlement monitoring of row.
At present, subgrade settlement is monitored in engineering mainly using the method for borehole survey sedimentation, sedimentation hole is bored in the soil body first,
Settlement monitoring device, such as sedimentation plate, sedimentation ring, settlement gauge, laser range finder, CCD etc. are laid in hole, is obtained at bore position
The soil body sedimentation.A kind of observation that soil deformation is surveyed based on slide rheostat for example introduced in patent of invention CN 105887792
Sedimentation plate displacement is converted into the change of slide rheostat resistance by device and method for measurement, is sunk by measuring resistance variations
The displacement of drop plate, drives sedimentation plate collaboration displacement using soil body sedimentation, by measuring sedimentation plate displacement and then obtaining soil body sedimentation.
A kind of frozen soil subsidence method and utility model patent based on CCD for example introduced in patent of invention CN1280606C again
A kind of integrated ground surface settlement monitoring device based on settlement gauge introduced in CN205482918U.It is common that these methods are present
Problem is：First, discrete spot measurement can only be carried out, some road key sections can only be tested, it is difficult to carry out covering big model
Enclose the road settlement monitoring of long range；Second, the durability existing problems of test system, due to the biography that current method of testing is adopted
Sensor is electric sensor, is easily caused damage in the long-term embedment soil body, it is difficult to maintain long-term durable test system.
The content of the invention
The invention aims to overcome existing roadbed settlement monitoring method measurement range limited, durability is not enough to ask
Topic, while meeting wanting for job stability of the high mountain permafrost area subgrade settlement monitoring to sensor-based system in extreme circumstances
Ask, there is provided a kind of high mountain permafrost distinguishes cloth subgrade settlement monitoring system and method.
A kind of high mountain permafrost of the present invention distinguishes cloth subgrade settlement monitoring system includes that many longitudinal directions connect
Continuous formula steel strand wires are strengthened distributed sensing fiber 1, many horizontal fixed-point type polymer and strengthen distributed sensing fiber 2, many surveys
Warm steel pipe 3, multiple fiber-optical grating temperature sensors 4, fiber Bragg grating (FBG) demodulator and Brillouin's time-domain analysis system 8；
Described many are longitudinally continuous formula steel strand wires and strengthen 1 parallel distribution of distributed sensing fiber, and many horizontal fixed-point types gather
Compound strengthens 2 parallel distribution of distributed sensing fiber, and is longitudinally continuous formula steel strand wires reinforcement distributed sensing fiber 1 and laterally determines
Point type polymer strengthens distributed sensing fiber 2 vertically, and horizontal fixed-point type polymer is strengthened distributed sensing fiber 2 and passes through thermometric
Steel pipe 3, fiber-optical grating temperature sensor 4 are to be carved with the optical fiber of multiple gratings, and multiple grating equidistantly distributeds, the optical fiber light
Grid temperature sensor 4 is fixed on the outer wall of thermometric steel pipe 3, and Brillouin's time-domain analysis system 8 is longitudinally continuous formula steel for obtaining
Twisted wire strengthens distributed sensing fiber 1 and horizontal fixed-point type polymer strengthens the Strain Distribution of distributed sensing fiber 2, optical fiber light
Grid (FBG) demodulator is used for the Temperature Distribution for obtaining fiber-optical grating temperature sensor 4.
Based on the roadbed settlement monitoring method of above-mentioned subgrade settlement monitoring system it is：
Step one, will be longitudinally continuous that formula steel strand wires strengthen distributed sensing fiber 1 and laterally fixed-point type polymer is strengthened point
Cloth sensor fibre 2 is embedded in below bedding of roadbed；
Step 2, using Brillouin's time-domain analysis system 8 measurement be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber 1
Strengthen the Strain Distribution of distributed sensing fiber 2 with horizontal fixed-point type polymer, be used to obtain light using fiber Bragg grating (FBG) demodulator
The Temperature Distribution of fine grating temperature sensor 4；
Step 3, according to formulaObtain the strain value of sensor fibre；WhereinAnd tr
The respectively initial Brillouin shift and initial temperature of sensor fibre, vBThe cloth of any test phase sensor fibre is respectively with t
In deep frequency displacement and temperature, CtFor the actual temperature transduction factor of sensor fibre, CsThe temperature that gained is demarcated when sensor fibre dispatches from the factory is passed
Sense coefficient and strain sensing coefficient, strain values of the ε for sensor fibre；
Step 4, conversion subgrade settlement：Strengthen distributed sensing fiber 1 by strain for formula steel strand wires are longitudinally continuous
Variable quantity qualitative characterization's settling amount, strengthens distributed sensing fiber 2 for horizontal fixed-point type polymer and passes through formulaSubgrade settlement is calculated, wherein ε is the strain that horizontal fixed-point type polymer strengthens distributed sensing fiber 2
Value, L are the fixed point spacing that horizontal fixed-point type polymer strengthens distributed sensing fiber 2, and H is subgrade settlement.
Subgrade settlement temperature monitoring system of the present invention and method, monitoring range depend on being longitudinally continuous formula steel strand wires
Strengthen distributed sensing fiber 1 and horizontal fixed-point type polymer strengthens the distribution situation of distributed sensing fiber 2, therefore monitor model
Enclosing can be very big.System architecture is hardly damaged in extreme circumstances, and job stability and durability are fully able to meet and require.
Description of the drawings
Fig. 1 is the structural representation that a kind of high mountain permafrost of the present invention distinguishes cloth subgrade settlement monitoring system
Figure.Fiber Bragg grating (FBG) demodulator is not embodied in figure；
Fig. 2 is the structural representation that horizontal fixed-point type polymer strengthens distributed sensing fiber 2.
Specific embodiment
Specific embodiment one：With reference to Fig. 1 and Fig. 2 explanation present embodiments, a kind of High aititude described in present embodiment
The distributed subgrade settlement monitoring system in Permafrost Area include many be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber 1,
Many horizontal fixed-point type polymer strengthen distributed sensing fiber 2, many thermometric steel pipes 3, multiple fiber-optical grating temperature sensors
4th, fiber Bragg grating (FBG) demodulator and Brillouin's time-domain analysis system 8；
Described many are longitudinally continuous formula steel strand wires and strengthen 1 parallel distribution of distributed sensing fiber, and many horizontal fixed-point types gather
Compound strengthens 2 parallel distribution of distributed sensing fiber, and is longitudinally continuous formula steel strand wires reinforcement distributed sensing fiber 1 and laterally determines
Point type polymer strengthens distributed sensing fiber 2 vertically, and horizontal fixed-point type polymer is strengthened distributed sensing fiber 2 and passes through thermometric
Steel pipe 3, fiber-optical grating temperature sensor 4 are to be carved with the optical fiber of multiple gratings, and multiple grating equidistantly distributeds, the optical fiber light
Grid temperature sensor 4 is fixed on the outer wall of thermometric steel pipe 3, and Brillouin's time-domain analysis system 8 is longitudinally continuous formula steel for obtaining
Twisted wire strengthens distributed sensing fiber 1 and horizontal fixed-point type polymer strengthens the Strain Distribution of distributed sensing fiber 2, optical fiber light
Grid (FBG) demodulator is used for the Temperature Distribution for obtaining fiber-optical grating temperature sensor 4.
As depicted in figs. 1 and 2, formula steel strand wires are longitudinally continuous and strengthen distributed sensing fiber 1 and horizontal fixed-point type polymer
Strengthen distributed sensing fiber 2 and adopt single mode communication optical fiber, the single mode communication optical fiber is processed through encapsulation reinforcement, it is ensured that sense light
It is fine that there is enough tensile strength and shearing strength.Sensor fibre is embedded in into 40cm-50cm depths below bedding of roadbed according to Fig. 1
Degree, wherein longitudinal optical fiber strengthens distributed sensing fiber, horizontal optical fiber using the continous way steel strand wires with continuous monitoring ability
Distributed sensing fiber is strengthened using the fixed-point type polymer with sectionalization test ability.Laterally fixed-point type polymer strengthens distribution
Formula sensor fibre 2 is spaced 1m by T-shaped fixed point support 9 and fixes.Laterally fixed-point type polymer strengthens distributed sensing fiber 2 from survey
Pass through in warm steel pipe 3, extraneous stress effect is completely cut off by thermometric steel pipe 3.Fiber-optical grating temperature sensor 4 is fixed on thermometric steel pipe
On 3.
By be longitudinally continuous per root formula steel strand wires strengthen distributed sensing fiber 1 two ends, per root horizontal fixed-point type polymer
The two ends at the two ends and every fiber-optical grating temperature sensor 4 of strengthening distributed sensing fiber 2 are passed through with multifiber cable 6
Fused fiber splice protecting box 5 is attached, and is collected into monitoring room by multifiber cable 6, in the indoor multifiber cable 6 of monitoring and optical fiber
Passage extensible frame 7 is attached by fused fiber splice, and each sensor fibre passage to optical-fibre channel extensible frame 7 is numbered.
Connected by the optical patchcord of joint model FC/APC between optical-fibre channel extensible frame 7 and Brillouin's time-domain analysis system 8
Connect, optical-fibre channel extensible frame 7 is also connected with fiber Bragg grating (FBG) demodulator.Formula is longitudinally continuous using Brillouin's time-domain analysis technical limit spacing
Steel strand wires strengthen distributed sensing fiber 1 and horizontal fixed-point type polymer strengthens the Brillouin shift amount of distributed sensing fiber 2
Distribution, obtains the Temperature Distribution of fiber-optical grating temperature sensor 4 using fiber Bragg grating (FBG) demodulator, and then obtains the road of monitored area
Base settling amount.
Above-mentioned monitoring system and method utilize the high density distributed measurement of brillouin distributed optical fiber sensing technology and surpass
The advantage of long distance sensing, and sensor fibre itself has the advantages that corrosion-resistant, low temperature resistant and long-term behaviour is stable so that should
System and method is highly suitable for the distributed long of high mountain permafrost area roadbed apart from long-term settlement monitoring.With tradition sedimentation
Monitoring method is compared, the present invention have measurement coverage length, being capable of the monitoring of continuous distributed formula and the outstanding advantage such as good endurance.
Specific embodiment two：Present embodiment is illustrated with reference to Fig. 1, present embodiment is based on described in embodiment one
A kind of high mountain permafrost distinguishes the roadbed settlement monitoring method of cloth subgrade settlement monitoring system, and methods described is：
Step one, will be longitudinally continuous that formula steel strand wires strengthen distributed sensing fiber 1 and laterally fixed-point type polymer is strengthened point
Cloth sensor fibre 2 is embedded in below bedding of roadbed；
Step 2, using Brillouin's time-domain analysis system 8 measurement be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber 1
Strengthen the Strain Distribution of distributed sensing fiber 2 with horizontal fixed-point type polymer, optical fiber light is obtained using fiber Bragg grating (FBG) demodulator
The Temperature Distribution of grid temperature sensor 4；
Step 3, according to formulaObtain the strain value of sensor fibre；WhereinAnd tr
The respectively initial Brillouin shift and initial temperature of sensor fibre, vBThe cloth of any test phase sensor fibre is respectively with t
In deep frequency displacement and temperature, CtFor the actual temperature transduction factor of sensor fibre, CsThe temperature that gained is demarcated when sensor fibre dispatches from the factory is passed
Sense coefficient and strain sensing coefficient, strain values of the ε for sensor fibre；
In the step, it is longitudinally continuous formula steel strand wires and strengthens 1 strain value of distributed sensing fiber and horizontal fixed-point type polymer
The computational methods for strengthening 2 strain value of distributed sensing fiber are identical；
Step 4, conversion subgrade settlement：Strengthen distributed sensing fiber 1 by strain for formula steel strand wires are longitudinally continuous
Variable quantity qualitative characterization's settling amount, strengthens distributed sensing fiber 2 for horizontal fixed-point type polymer and passes through formulaSubgrade settlement is calculated, wherein ε takes the strain that horizontal fixed-point type polymer strengthens distributed sensing fiber 2
Value, L are the fixed point spacing that horizontal fixed-point type polymer strengthens distributed sensing fiber 2, and H is subgrade settlement.
Said method can be arranged according to scope to be measured and is longitudinally continuous formula steel strand wires reinforcement distributed sensing fiber 1
Strengthen distributed sensing fiber 2 with horizontal fixed-point type polymer, therefore, the scope that the method can be measured is big；And due to adopting
Stability and durability are very high in extreme circumstances for monitoring system, therefore the method in extreme circumstances also can be steady for a long time
Fixed measurement.
Claims (2)
1. a kind of high mountain permafrost distinguishes cloth subgrade settlement monitoring system, it is characterised in that be longitudinally continuous including many
Formula steel strand wires strengthen distributed sensing fiber (1), many horizontal fixed-point type polymer reinforcement distributed sensing fiber (2), many
Thermometric steel pipe (3), multiple fiber-optical grating temperature sensors (4), fiber Bragg grating (FBG) demodulator and Brillouin's time-domain analysis system (8)；
Described many are longitudinally continuous formula steel strand wires and strengthen the parallel distribution of distributed sensing fiber (1), many horizontal fixed-point type polymerizations
Thing strengthens distributed sensing fiber (2) parallel distribution, and be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber (1) with it is horizontal
Fixed-point type polymer strengthens distributed sensing fiber (2) vertically, and horizontal fixed-point type polymer is strengthened distributed sensing fiber (2) and worn
Thermometric steel pipe (3) is crossed, fiber-optical grating temperature sensor (4) is the optical fiber for being carved with multiple gratings, and multiple grating equidistantly distributeds,
The fiber-optical grating temperature sensor (4) is fixed on the outer wall of thermometric steel pipe (3), and Brillouin's time-domain analysis system (8) is used for
Acquisition is longitudinally continuous formula steel strand wires and strengthens distributed sensing fiber (1) and horizontal fixed-point type polymer reinforcement distributed sensing fiber
(2) Strain Distribution, fiber Bragg grating (FBG) demodulator are used for the Temperature Distribution for obtaining fiber-optical grating temperature sensor (4).
2. the subgrade settlement of cloth subgrade settlement monitoring system is distinguished based on a kind of high mountain permafrost described in claim 1
Monitoring method, it is characterised in that
Step one, will be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber (1) and horizontal fixed-point type polymer strengthen be distributed
Formula sensor fibre (2) is embedded in below bedding of roadbed；
Step 2, using Brillouin's time-domain analysis system (8) measurement be longitudinally continuous formula steel strand wires strengthen distributed sensing fiber (1)
Strengthen the Strain Distribution of distributed sensing fiber (2) with horizontal fixed-point type polymer, optical fiber is obtained using fiber Bragg grating (FBG) demodulator
The Temperature Distribution of grating temperature sensor (4)；
Step 3, according to formulaObtain the strain value of sensor fibre；WhereinAnd trRespectively
For the initial Brillouin shift and initial temperature of sensor fibre, vBThe Brillouin of any test phase sensor fibre is respectively with t
Frequency displacement and temperature, CtFor the actual temperature transduction factor of sensor fibre, CsThe TEMP system of gained is demarcated when sensor fibre dispatches from the factory
Number and strain sensing coefficient, strain values of the ε for sensor fibre；
Step 4, conversion subgrade settlement：Strengthen distributed sensing fiber (1) by straining change for formula steel strand wires are longitudinally continuous
Change amount qualitative characterization's settling amount, for horizontal fixed-point type polymer strengthens distributed sensing fiber (2) by formulaSubgrade settlement is calculated, L is between the fixed point that horizontal fixed-point type polymer strengthens distributed sensing fiber (2)
Away from H is subgrade settlement.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091615A (en) * | 2017-06-14 | 2017-08-25 | 四川睿铁科技有限责任公司 | A kind of intelligent geotextiles monitored suitable for high ferro subgrade deformation with controlling |
| CN110132228A (en) * | 2019-05-07 | 2019-08-16 | 哈尔滨工业大学 | A kind of subgrade settlement disease positioning based on flush type distribution optical cable and sedimentation degree characterizing method |
| CN111521126A (en) * | 2020-04-28 | 2020-08-11 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional reconstruction of submarine pipeline |
| CN113431018A (en) * | 2021-05-28 | 2021-09-24 | 中交第一公路勘察设计研究院有限公司 | Frozen soil roadbed deformation field optimization monitoring equipment and method based on grating array |
| CN113899343A (en) * | 2021-12-09 | 2022-01-07 | 湖北工业大学 | Foundation settlement monitoring system and method based on distributed optical fiber strain sensing technology |
| CN113932944A (en) * | 2021-10-12 | 2022-01-14 | 深圳大学 | System and method for monitoring displacement, strain and temperature in soil |
| CN114111712A (en) * | 2022-01-26 | 2022-03-01 | 天津风霖物联网科技有限公司 | System and method for monitoring building settlement |
| CN114199679A (en) * | 2021-12-09 | 2022-03-18 | 南京大学 | Optical fiber drawing-based distributed in-situ testing device and method for frozen soil multi-physical-property parameters |
| CN114518095A (en) * | 2021-12-28 | 2022-05-20 | 湖北三江航天红峰控制有限公司 | Rock-soil mass deep displacement monitoring method |
| CN115127513A (en) * | 2022-06-30 | 2022-09-30 | 兰州大学 | Long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis |
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| CN107091615A (en) * | 2017-06-14 | 2017-08-25 | 四川睿铁科技有限责任公司 | A kind of intelligent geotextiles monitored suitable for high ferro subgrade deformation with controlling |
| CN110132228A (en) * | 2019-05-07 | 2019-08-16 | 哈尔滨工业大学 | A kind of subgrade settlement disease positioning based on flush type distribution optical cable and sedimentation degree characterizing method |
| CN110132228B (en) * | 2019-05-07 | 2021-02-19 | 哈尔滨工业大学 | Roadbed settlement disease positioning and settlement degree characterization method based on embedded distributed optical cable |
| CN111521126A (en) * | 2020-04-28 | 2020-08-11 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional reconstruction of submarine pipeline |
| CN113431018A (en) * | 2021-05-28 | 2021-09-24 | 中交第一公路勘察设计研究院有限公司 | Frozen soil roadbed deformation field optimization monitoring equipment and method based on grating array |
| CN113932944A (en) * | 2021-10-12 | 2022-01-14 | 深圳大学 | System and method for monitoring displacement, strain and temperature in soil |
| CN113899343A (en) * | 2021-12-09 | 2022-01-07 | 湖北工业大学 | Foundation settlement monitoring system and method based on distributed optical fiber strain sensing technology |
| CN114199679A (en) * | 2021-12-09 | 2022-03-18 | 南京大学 | Optical fiber drawing-based distributed in-situ testing device and method for frozen soil multi-physical-property parameters |
| CN114518095A (en) * | 2021-12-28 | 2022-05-20 | 湖北三江航天红峰控制有限公司 | Rock-soil mass deep displacement monitoring method |
| CN114111712A (en) * | 2022-01-26 | 2022-03-01 | 天津风霖物联网科技有限公司 | System and method for monitoring building settlement |
| CN115127513A (en) * | 2022-06-30 | 2022-09-30 | 兰州大学 | Long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis |
| CN115127513B (en) * | 2022-06-30 | 2024-02-02 | 兰州大学 | Long-distance pavement structure settlement monitoring method based on combined distributed optical fiber sensing technology and parameter inversion analysis |
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Inventor after: Wang Shuangjie Inventor after: Zhang Juan Inventor after: Li Hui Inventor after: Xu Jinlong Inventor after: Dong Yongkang Inventor after: Zhou Wensong Inventor after: Li Jinping Inventor after: Yuan Kun Inventor before: Zhang Juan Inventor before: Li Hui Inventor before: Xu Jinlong Inventor before: Dong Yongkang Inventor before: Zhou Wensong Inventor before: Li Jinping Inventor before: Yuan Kun |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |